Sulfur Dioxide → Sodium Pyrosulfite

HRID 1600472Notes

Reaction equation

HRID 1600472 reaction equation
[S:1](=[O:3])=[O:2].[OH-].[Na+:5].[S:6]([O-:9])([O-:8])=[O:7].[Na+].[Na+]>>[S:6]([S:1]([O-:3])=[O:2])([O-:9])(=[O:8])=[O:7].[Na+:5].[Na+:5]

Participants

4

Reactant 3

HCID 1119Sulfur DioxideHCID 14798Sodium HydroxideHCID 24437Sodium Sulfite

Product 1

HCID 656671Sodium Pyrosulfite

Procedure

Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide present with a pH between 3.5 and 4.2. The solution is drawn to a cooling crystallizer where an alkali such as soda ash, caustic soda, sodium sulfite, and mixtures thereof is added to produce additional sodium metabisulfite that increases the yield of sodium metabisulfite crystallizing per pass. The mother liquor is recycled.

Workup

  1. additionthereof is added

Sources & evidence

ORD record
ord-6e2e1cb222ad4fc58aeec33ba35c2003
Source dataset
uspto-grants-1999_11
Patent number
US05976485

Reaction notes

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